Let's Figure Out Infinity Once And For All

It’s probably time to fire up that second cup of coffee; the journey that TED-ED lecturer Dennis Wildfogel is about to take you on is one of infinite infinities. In other words, it’s going to make your brain hurt. But it also just might make you smarter.

Or, at least, infinitely frustrated. But at least the sheep illustrations are cute? [Brainpickings]